Improvement in grindinq-mills



GEORGE QGONNORAND HAINEs oGoNNo'R, 0E MISHAWAKA, INDIANA,

\ Letters Patent No. 105,592, dated July 19, 1870.

IMPROVEMENT IN GRINDING-MILLS.

The Schedule referred to in .these Letters Patent and making part of the 'saine To all whom it may concern.:

Be it known that we,f`-GEonGE OCONNon and `liIAnvEs OGONNOR, of Mishawaka, in theState of Indiana, have invented `certain new and useful Improvements in Grinding-Mills and wedo hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying draw- .ings and to the letters of reference 4marked thereon,

forming apart of this specification.

Figure '1 represents the revolving plate. Figure 2`represents the stationary plate. `Figure 3 represents the line of action of the grooves in operation.

Figure 4 is a sectional view of plate A.

Figure 5 is asectional view of plate B. Our nventlonconsists in the construction, arrangeinent, and operationoi' two dissimilar grindingplates,

i one stationary andthe other revolvingv upon it.

'.lhe upper or" revolving plate has a concave face, and is constructed `withicm'vilincar. grooves, which grooves extend from `the inner to the outer edge of the revolving plate. j `The stationary plate has a convex face, and is constrncted with a numberv of receiving openings, and also with curvilinear grooves, running from the inner to the outer edge, or from a point back o f said-receiving openings, and frornfabont midway of the face of thc plate to the outer edgefor periphery.

.lhese curvilinear grooves, in both plates, vgrow more shallow asthey approach the outer edge orperiphery, and also come nearer together.V

`'.'Llie,operation in grinding is such that the upper plate, with thc convex face and grooves, revolving upon the ylower plate with the convex face and grooves, the grooves and ridges cross each other in action, as shown in fig. 3, and the grain received inthe receiving openings lis broken and constantly' ground finer and liner as it nears the outer edge orperip'hery of the plates, by

y whichl means clogging is prevented, as' the draft or throw-of, from the peculiar direction ofthe grooves, becomes greater as its nears the'onteredge or periphery,where it is most needed.

,To enable othersskilled in the art to constrnctand operate our invention, we proceed to describe it'more particularly. A, iig. 1, is the revolving plate, having a concave face with curvilinear grooves running from theinner to the outer edge or periphery of the plate, as shown in the drawings, and marked a a, a a, .occupying the surface of the-plate.

B, ig. 2, is the stationary plate upon which the plate A revolves.

The plate B has a convex face, with'curvilinear grooves running from the inner to the outer edge or periphery, or from any pointY back of the receiving openings, which are constructed on the inner edge of the-plate, and' may be eleven in number, more or less,

for the admission of the grain between the plates.4

These last grooves are shown in the drawings marked b b b b, occupying the surface of the outer half of the plate B.

d d d .d are ridges formed uponplate- B, running I.

from the eye oli-inner edge, tothe outer edge or pe riphery of plate B, thereby forming the openings to' receive the grain, for the purpose of grindingwhile passing out through the grooves b b b b, 85o.

It is manifest, however, that they may be made to run from the inner edge of the plate B, between the receiving openings, without c hanging their act-ion or the principle of their operation. v

The receiving openings made by the ridges ,in the plate B, are marked c c c c o c c c c c c.

The plates thus constructed-and arranged are operated with suitable shafting and gearing, and by the usual power, in the manner well known to mechanics in machinery of Athis description, all of which is old, and forms no part of our invention. l

By the arrangement and construction before dcscribed, we also avoid a multiplication of grooves, the plates in action operating from the inner to the outer edge or periphery, upon thcprinciple of an increasing draft. ,Y

lVhat 'we claim as our invention, and desire to secure by Letters Patent, is i 1. The combination of the grinding-plates A and B, when provided with curvilinear grooves a, grooves b, and ridges d, in the manner and for the purpose herein described.

2; The construction and arrangement of the curvilinear `ridges d, in the manner herein described, so that receiving-openings are formed between `said ridges cl, upon the plate B.

v J Amro R. Mense. 

